The reason why the valve cannot be lifted is still ringing.

1. The reason why the throttle can't speed up is that the clutch slips. The main reasons for clutch slipping are: insufficient friction of clutch friction plate, shifting gear when clutch is not in place, running of sports car for one and a half hours, slipping when stepping on clutch.

2. Clutch slippage is mainly manifested in that when the vehicle accelerates, the vehicle speed cannot be increased with the increase of engine speed, and the power of the engine cannot be completely transmitted to the driving wheels, resulting in driving fatigue, especially when going uphill.

3. Throttle, also known as "throttle" and "throttle", refers to the control device that controls the engine power. In piston aero-engine, the throttle valve controls the opening of carburetor to control the inflation of cylinder, thus determining the output power of the engine.